Answer:
Elion and her colleagues were responsible for developing important drugs.
Step-by-step explanation:
From the passage, Elion joined Burroughs Wellcome Laboratorie, a company that deals in the manufacture of prescriptive medicine in 1944 and started as an assistant before working with Hitchings for 40 years. Together, they developed drugs that were effective in treating/curing various ailments.
She and her team were responsible for developing important drugs because of their research and development of drugs.